Mack DM600 Cab & Chassis. Heavy duty 1969 year model. Double frame. 673 – 6 cylinder diesel engine with turbo and 214,430 miles. Two stick 5 + 4 Transmission with 58K lbs. rears. There are good tires all around. Air ride driver seat, air brakes, and differential lock. Frame measurement from the back of the cab to the end of the frame is 21.4 ft. in.